Iran. M. Environ. Well being. Sci. Eng., 2010, Volume. 7, Number 2, pp. 299-306
EXPANSION, PHOTOSYNTHESIS AND RESPIRATORY RESPOND TO COPPER IN LEMNA MINIMAL: A POTENTIAL USE OF DUCKWEED IN BIOMONITORING Downloaded from http://journals.tums.ac.ir/ on Thurs night, February twenty-three, 2012 * N. Khellaf, M. Zerdaoui Laboratory of Environmental Anatomist, Faculty of Engineering, Badji Mokhtar School, Annaba, Algeria Received three or more February 2010; revised twenty one Jully 2010; accepted 20 August 2010
Aquatic macrophytes will be known to collect various weighty metals within their biomass. This accumulation is often accompanied by physiological changes which may be used in biomonitoring for marine pollution. In this study, the effect of copper mineral (Cu) for the growth of the duckweed Lemna minor, then its removal, was researched with 0. 1вЂ“1. 0 mg/L of Cu within a quarter CoГЇc and Lesaint solution at pH=6. 1 ) In order to validate duckweed patience to Cu, photosynthesis was measured in the maximal concentration which caused no impact on the plant progress. The benefits showed that copper inhibited Lemna growth at concentrations в‰Ґ 0. 3 mg/L. At 0. 2 mg/L, the final biomass was roughly four times greater than the initial biomass. Examination of metallic concentration in water demonstrated that Lemna minor was responsible for the removal of 26% of Cu through the solution. In the presence of Cu, breathing was lowered, while the natural photosynthesis increased substantially. Net the natural photosynthesis approximately increased three times in comparison to the control. Birdwatcher was accountable for 130-290% increase in the photosynthetic activities. These types of results recommended that Lemna minor may well be a good device for the evaluation of copper polluting of the environment in biomonitoring programs. Key phrases: Aquatic air pollution; Bioindicator; Lemna minor; Physiological modifications; Development; Photosynthesis
Copper (Cu) is a vital element for organisms and it is involved in several physiological procedures (Teisseire and Guy, 2000). However , it can be toxic at higher concentrations by creating deleterious effects to human being, animals and plants (Vinodhini and Narayanan, 2009). Excess of Cu may well reach living organisms because of environmental pollution caused by anthropogenic activities (mining operations, developing industries and agricultural technologies) which can modify the biogeochemical cycles with the metal. Many studies demonstrated that many types of duckweed, a group of free-floating fresh water plants with the family Lemnaceae, are able to *Corresponding author: Email: [email protected] fr Tel/Fax: +213 38 87 60 sixty five
absorb and accumulate large amount of copper within their biomass making an internal focus several fold greater than the nutrient medium (Jain et al., 1989; Zayed ain al., 98; Miretzky ainsi que al., 2005; Ater ainsi que al., 2006). This accumulation has, relatively, a romance with the patience phenomena which is defined as the cell power to protect grow tissues against injury due to the steel (Sabreen and sugiyama, 2008). At metallic concentration higher than the suffered concentration, degree of toxicity symptoms and physiological improvements are induced. Cupric ions are responsible for a lot of alterations of plant skin cells and inhibition of enzymatic activities (Teisseire and Guy, 2000). In addition they cause significant changes in respiration, photosynthetic CO2 fixation and photosynthetic pigments by 299
N. Khellaf et 's., a comparatIVE aNaLytIcaL Study...
Downloaded via http://journals.tums.ac.ir/ upon Thursday, Feb . 23, 2012
increasing oxidation of chloroplast membranes (Prasad et al., 2001; Hattab et approach., 2009). These types of physiological changes, evaluated by simply biotoxicity checks, can be used because an indication of metal pollution and give data in biomonitoring (Movahedian et 's., 2005). Non-active macrophytes because bioindicators have some advantages just like high patience to aquatic metal polluting of the environment, convenience pertaining to sampling, significant individuals and simple to realize laboratory raise (Zhou et approach.,...
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